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  <h1 class="title">简介</h1>
  <p class="para">
   Those functions provide means to execute commands on the
   system itself, and means to secure such commands.
  </p>
  <blockquote class="note"><p><strong class="note">Note</strong>: 
   <p class="para">
    All execution functions call the commands through
    <em>cmd.exe</em> under Windows. Therefore the user calling these
    functions needs appropriate privilege to run this command. The only
    exception is <span class="function"><a href="function.proc-open.html" class="function">proc_open()</a></span> with
    <em>bypass_shell</em> option.
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